Casing and coil assembly for heat transfer devices



May 19, 1931. J,

CASING AND COIL A Filed Nov. 8, 1929 E. E RCANBRACK SSEMBLY FOR HEAT TRANSFER DEVICES 3 Sheets-Sheet 1 'Y 1931i J. E. ERCANBRACK 1,806,450

CASING AND COIL ASSEMBLY FOR HEAT TRANSFER DEVICES 3 Sheets-Sheet 2 Filed Nov. 8, 1929 t I s \\v\ 55 F. a I I 210$ wwss men/Z64 I J. E. ERCANBRACK 1,806,450

SING AND COIL ASSEMBLY FOR HEAT TRANSFER DEVICES Filed Nov. 8, 1929 3 Sheets-Shqet 3 Patented May 19, 1931 FATE r QFFICE CASING AND (JOEL ASSEMBLY FDR HEAT TRANSFER DEVICES Application filed November 8, 1929. Serial No. 405,588.

My present invention has relation to the provision of an assembly of casings and coils in heat ransfer devices. As will hereafter be seen, the variety of heat transfer devices in connection with which 1 have illustrated my invention are designed for the transfer of the heat of boiler water to service water employed for domestic, manufacturing or other purposes. In the class of heat trans- 1 for devices in connection with which I have illustrated the application of my invention there is provided-a casing connected to the boiler insuch a manner as to secure a thermal or gravity circulation of the boiler. water through the casing and in the casing is installed a coil, for the absorption of heat from the boiler water, through which coil at least a portion of the service water supply is caused topass. The cooling of the boiler water in the casing through the giving up of its heat to the coil is conducive to sedimentation of certain varieties of materials usually, or not infrequently, present in water supplies. While, on the other hand, the heating of the service water in the coil tends to cause a precipitation therein of elements almost always present in water supply in greater or less quantities which give to the water a character described as hardness. The sedimentation and precipitation, heretofore noted, re-

quiresthe cleaning from time to time of both the casing and the coil and to permit and facilitate a thorough cleaning it is highly de- H sirable to design the casing and connect the same with the coil in such a manner as to permit of the easy disassemblingand assembling of these parts. The provision of such a connection is the object of my invention.

I have attained the foregoing object by means of the instrumentalities illustrated in the accompanying drawings, in which- Fig. 1 is a schematic illustration of a typical boiler, heat transfer device and service hot water storage tank with which my invention is advantageously employed;

Fig. 2 is a vertical central section through a casing and coil assembly. embodying my invention; to Fig. 3 is a fragmental plan of thestructure shown in Fig. 2, a portion thereof being shown in section;

Fig. 4 is an end view of the coil member of the connection;

Fig. 5 is a central vertical section similar to Fig. 3 showing a modified form of casing and coil assembly;

Fig. 6 is a view of the inner end of the holding member of the connection;

Fig. 7 is a vertical central section of a still further modified casing and coil assembly; and

Fig. 8 is an end view looking towards the coil of the holding member of the connection.

Similar reference characters refer to simi lar parts throughout the respective views.

In Fig. 1 I have illustrated a typical form of boiler 10, either of the hot water or steam type, to which is connected by an upper feed pipe 11 and a lower return pipe 12, a heat transfer casing 13. The heat transfer casing 13 shown is generally cylindrical with the lower portion or bottom 1% integral and having a flange 15 at the top. The flange 15 is perforated at intervals 16 (as indicated in Fig. 3) for the passage of bolts for securing to the casing 13 the cover or closure 17 The integral bottom it of the casing is provided with a central cmbossment 18 which is bored and tappedfor assembly with the return 12. The arrangement thus far described secures a thermal or gravity circulation of the boiler water through the casing 18.

At the top and bottom thereis provided on one side of the casing hollow embossments 19 which communicate with the interior of the casing and which are formed in one of the manners hereinafter described for securing a heat transfer coil within the casing and as sembling the coil with a hot water service supply.

All of the constructions hereinafter described employ a modification of what is known as a railroad joint or connection in which the meeting surfaces of the joint have a ground fit and at least one of which surfaces is partially cylindrical. A typical railroad joint is not adapted to the situation hereinafter described as the joints I employ must support the heat transfer coil as well as establishing connection between the coil and the laterally at 20 opposite the opening 21 which provides communication between the embossment 19 and the Einterior'of the casing 13.

Upon the casing side the opening 21 is flared to provide the inclined surface 22 which is ground to form one seat of the connection. About the interior edge of the inclined surface 22 is an i'nterior, annular development Fittings 24 are brazed or otherwise secured to the ends of the'heat transfer coil 25. The

end of the fitting 24 is provided with a ground somewhat spherical surface 26 which co-operates with the inclined surface 22 and back j ofgthe surface 26 the fitting 24 is provided with a shoulder 27 co-operating. with the annular development 23 to support the weight of-the heat transfer coil in the casing. ."'The fitting 24 is provided with-a spider 28,the center whereof is bored and tapped to receive the bolt 29.

v Thelateral opening-20 inv thehollow embossment 19'has' the outer portion thereof enlarged to provide an inclined or beveled surface 30, which is ground, and theinner por-. tion of the head of the bolt 29 is provided with a ground somewhat spherical surface 31 which 'co -op'erates with the inclined 7, surface 30. The bolt -29-thus provided operates to draw and retain the fitting 24 in position and at the same time to close and sealthe'bore 20. The hollow embossment 19: is bored and tapped from the top, as at 32, to receivethe threaded pipe 33 constituting .a connection between the coil and the hot water service system. The bottom hollow embossment 19 is precisely the same as heretoforedescribed except thatthe bored andtapped hole 32, en- 'ters at the-bottom instead of the top; 7 '2 The constructionshown in Figs. 5 and'6 differs-from that shownin Figs. 2 to" 4 inclusivein the omissionof thespider 28 from thefitting 24 and for in position the end of the fitting 24 is interion ly tapped, as at 34, which co-operates with aforni of bolt, the stem whereof is eXpanded to form what might be called a conical or pyramidal spider 35, theinner or larger end whereof is threaded, as at 36, to co operate 1 case the opening 20a has to be considerably the. ends thereof,

1 have tioned seats extending into co-operation with holding the fitting 24 r a I 7 .ing and to with the threads 34 of'the fitting 24. In this b differs from those heretofore described principallyin a longitudinal shortening of the holding element. In this last modification the spider isalso omitted and the fitting 24 is provided with interior threads 340. In this latter case, however, I provide, in connection with theinwardly facing oblique ground surface 22 an outwardly facing oblique ground surface 37. In this latter case the bolt 29 and the bolt with the spider development 35 is replaced by nipple 38, the outerv end of which is enlarged and provided with an eX- terior ground surface '39 co-operating'with theground surface37. Interiorradial dogs 40v are provided in the enlargedfend of the nipple 38 to'receive a tool for screwing the nippleinto position. In this case thelateral opening 20b through which thenipple is introduced is internally threaded to receive the ordinary threaded plug 41. In each embodiment of my invention .I secure a connection between theheat transfer coil and thecasingin which it is installed which may be easily assembled and disassembled and which has the eflicacies and advantages of the ordinaryrailroad joint, while at the same time it provides support for the heat transfer coil which eliminates strain upon the ceiling connection between the coil and the casing. 7 Having described my invention what I claim is new and desire to secure by Letters Patent is: j i w 1. A casing and coil assembly in. heat trans,- fer devices comprising a casing provided with a pair of spacedhollow embossments having communication with the compartment within the casing, the casing side of the openings providing such communication being provided with a ground seat surrounded by an annular shoulder, acoil and fittings for said batten provided with interior spider brackets and ground seats co operating with the seats in said casing, and provided with cylindric portions entering I said annular shoulders, said hollow embossments being bored and provided with ground seats opposite their points of communication with said casing, and bolts the headswhereof seats "cooperating with said last mens'aidspiders. i

2. In 'a casing and coil assembly for heat transfer devices, a casing havinga mainand 3. In a casing and coil assembly, fa casing having a main and an auxiliary chamber with a port affording communication therebetween, seats opposing related to said port, a coil fitting co-operating with one of said seats, and a holding member co-operating with the other of said seats and extending into engagement with said coil fitting.

4. In a casing and coil assembly, a casing having a port, an inwardly facing seat with an annular shoulder upon one side of said port, a seat disposed opposite said first men tioned seat, a coil fitting having a cylindrical portion and a seat co-operating with said seat and shoulder and a holding member co-operating with said opposing seat and extending into engagement with said coil fitting 5. In a casin and coil assembly, a casing having a port, an inwardly facing seat upon one side of said port, a seat disposed opposite said first mentioned seat, a coil fitting having aseat co-operating with said first mentioned seat and a holding member co-operating with said opposing seat and extending into engagement with said coil fitting.

' JOHN EDWARD ERCANBRACK. 

